SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62372b4371af3250a95ce0cb1e513964d2cabeb00a8bf444390e78a6a9c8066e' 
  AND token = 'Bgq4A0+zpj92llVOnJyzzYWCpISh1jipoggsPe/WcjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}